Shiva Purana
एको देवो महादेवो विज्ञेयस्तु महेश्वरः ॥ न तस्य परमं किंचित्पदं समधिगम्यते ॥ १५ ॥
That lord Śiva shall be realised. There is no other region greater than his worthy of attainment.
english translation
eko devo mahAdevo vijJeyastu mahezvaraH ॥ na tasya paramaM kiMcitpadaM samadhigamyate ॥ 15 ॥
hk transliteration by Sanscript